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Патент USA US2117327

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May 17, 1938.
l. H. lHM ET AL. '
Filed March 12, 1935
2 Sheets-Sheet l
[Fig 2 I \
May 17, 1938.
Filed March 12, 1935
2 Sheets-Sheet 2
l I| i l
Patented May 17, 1938‘
‘Ivan H. Ihm and Charles'F. Tuttie, Richmond,
Calif., assignors to Standard Oil Company of
California, San Francisco, Calif., a corporation
of Delaware
Application March 12, 1935, Serial No: 10,622 . I
2 Claims.
This invention relates to a boring machine and
more particularly to a boring machine tool which
is adapted to be used for resurfacing and similar
(01. 77-58)
view of the keyed feed bar used in these examples.
Referring to the drawings and particularly to
the grooving tool embodiment shown in Figures
operations in restricted bores of heavy and rela-' ‘ 1, 2 and 3, the numeral l0 indicates a header, dia
I tively immovable equipment, such as pressure still grammatically shown here in section ‘and pro
headers which may be in place in a furnace.
vided with the usual tubeseat bore H, with
Heretofore, it has been the practice, when ma
grooves l 2, and I 3, into which a tube may be rolled
chining operations are required'on the grooves or expanded into .place in the conventional man
and the likev of equipment such as pressure still
10 headers, to 'remove them from their place in the
furnace, and take them to a machine shop, where
the machining is done. Inasmuch as these ?t
tings are normally ?xedly supported in the fur
nace and are further secured as ?rmly as possible
The tapered seat l4, into which a cap or
plug closure for the header is adaptedlto seat,
forms with the tube seat, a restricted bore, which
makes accurate machining operations on the
grooves i2 and I3 particularly di?icult.
The body l5 of the tool is ‘generally cylindrical '
15 to the tubes, to prevent leakage and blowing off . in shape and is provided with a turning or drive
due to internal pressure, this is ,a‘ very expensive
and inconvenient, as well as time consuming pro
cedure.‘ Certain types of alloy tubes are severe
ly weakened and damaged by the heating which
A guide bushing l9 substantially surrounds body
usually accompanies header removal, and in some ,
l5 and is preferably collapsible, in this case be
cases where the tubes ,are welded to the headers,
ing made in three or more segments as shown, and
- the tubes must be cut and destroyed, or at least,
is adapted to be ?rst inserted in bore II in parts,
shortened, before the headers can be taken off.
It is an object of this invention to provide a
25 portable means-for doing accurate ?eld machine
boring, and the like in heavy and relatively im
movable equipment, such as pressure still headers.
Another object is to provide a means for ac
curately aligning and positioning a boring ma
30 chine tool in a restricted bore to operate on the
Another object is to provide a compact and
rugged cross-teed means for a boring tool of this
Another object is to provide a simple and ac
curate portable boring machine and guide means
therefor adapted to remachine restricted bores.
These and other objects will be further ap
parent from the following description and from‘
40 the appended drawings, which form a part of
this speci?cation and illustrate an example of a
preferred embodiment of this invention. In the
bar I6 which may be secured thereto permanent
ly, or detachably as by'the squared end I‘! which
is received in a corresponding square recess iii.
and then assembled by means of spring wire re
tainers 20, which are snapped into grooves 2!. It
will be noted that the bushing subtends only
about 300° of the body I 5, in order to allow the 25
cutting tool and the holder therefor to be ex
tended radially to reach groove l2 or l3. This
proportion has been found adequate to center the
body IS in bore II.
Bushing I 9‘ is carried around. with tool body 30
l5, by means of the longitudinal key 22 which is
secured in a key seat 23 in the body. The pe
riphery of bushing‘ I9 is provided with a raised
portion or ring 24, which engages groove l2, and 35
aligns the bushing longitudinally in bore ll. .
There are two notches 25_ and 2G, in the trailing
or driving edge of bushing l9, notch 25 being
aligned with, or at least spaced from, groove I 2,
and notch 2.6 located in the same relation to 40
groove l3. A lug 21 on key 22 engages either
notch and aligns body I5 in bushing I 9 to operate
on whichever groove is to be machined.
. Figure 1 is a side elevation view of a boring tool,
4‘ in place in, a header ‘and adapted to remachine
the grooves into which the tube is expanded.
The cutting tool 28, for accomplishing the ma
chining is secured in a generally cylindrical‘ tool
post or holder 29, as by set screws 30, 3i and 32.
Figure 2 is a.vertical sectional view on line’ Holder 29 is received in a transverse bore 33 in
II-II of Figure l, and illustrates the tool hold
body I 5, and is movable longitudinally in said
ing, feeding,‘ and guiding means of this embodi
bore by means of inclined grooves 34 in which
are received complementary inclined teeth 35 ‘on
Figure 3 is a vertical longitudinal sectional view a cylindrical feed bar or element 36 (Figures 4,
on line III-Ill of‘Figure 2.
Figured is a top \view of the tool‘ post used in
these examples.
Figure 5 is an end view and Figure 6 a bottom
5 and 6.)'
Feed bar 36 is positioned in longitudinal bore
31 in body l5 (Figures 2 and 3), and is prevented
from rotating therein by a key 38, received in
2,117,327 a
keyway 39. Feed'bar “has an axial threaded
bore 40 in which a correspondingly threaded feed
rotating body (l5 through the medium of drive
vented from moving longitudinally therein by
bar IS, with a periodical partial rotation of the
feed screw extension member 41, the machining
of grooves H or l3 in bore ll of the header l0
may be carried out uniformly, accurately, and to
?ange 43, secured in body l5 by a threaded lock
the depth desired.
screw 4i is received. Feed screw 4| extends into
bore 31 through a smaller bore 42, and is pre-v
nut 44. The outer end of feed screw 4|, in the
example shown, is squared as at 45 to be re
ceived in a correspondingly squared socket 46
10 on a removable extension member 41., which lat
ter projects outwardly along drive bar~l6 (Fig
ure 1) to a point where both are accessible out-v
' It will be appreciated that this invention is
adapted to other uses than that given, and may
be described as involving a rotatable body carry
ing a generally transversely movable tool post 10
and cutting tool, with means extending from said
body for moving the tool post as may be required,
and means for centering the body and also for
align and support feed screw extension member ‘\ guiding it in the path which it is desired the
tool will take. While a speci?c construction has
15 41 and drive bar 16, the former being retained
longitudinally therein by collars 49, and ‘also been described and illustrated'to carry out these
side oi’ header I0. Spacers 48 are provided»v to,
in turn are secured to bar l6.»
operations and functions, it is to be understood
that the invention is not limited to that device,
In operation, guide bushing i9 is ?rst set into
bore II, with ring 24 engagingxgroove l2. Body
and all such modi?cations and changes as come
within the scope _of the appended claims are em
I5 is then inserted in bushing l9 and rotated to
engage lug 21 on key 22 in notch 25 of bushing
it, if groove I2 is to be deepened. If-groove I3
is to be operated on, lug 21 is engaged in notch
20. Cutting tool 28 is then moved outwardly into
braced thereby.
being adapted to be rotated in spacers 48, which
operative position by rotating feed screw 4i,
which, by virtue of-its threaded engagement with
the keyed feed bar 36fmoves the latter longi
tudinally in bore 31, thus sliding tool holder 29
30 transversely due to the interaction of inclined
teeth 35 in grooves 34.
In one example, with a tooth and groove angle
“A" (Figures 4 and 6) of about 21 degrees 48
minutes and 5 seconds, which is a slope of 4.80
35 inches in 12 inches, and with a feed screw hav- '
ing 10 threads per inch, the tool was moved out
‘ wardly from body IS a distance of 0.040 inch for
each complete turn of the feed screw. Thus by
We claim:
1. A tube seat grooving-‘tool comprising a body,
a radially extensible cutter onsaid body, a guide
means for said body comprising a longitudinally 25
split bushing adapted to be received within said
tube seat and to engage a groove therein, means
for holding said bushing in place in said- tube
seat prior to the insertion of said body, and
means selectively connecting said body and said 30
guide means to space said body and said cutter
longitudinally in said tube seat with regard to the
groove engaged by said guide means.
2. A tube seat grooving tool ‘according to claim
1 in which said bushing substantially encircles, 35
said body to align it centrally in said tube seat.
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